Fatigue performance testing device for femoral component with handle

Abstract

The utility model discloses a device for testing the fatigue performance of a femoral component with a handle, which comprises a working table, a fixed cylinder is fixedly mounted at the top of the working table, a plurality of groups of square holes are formed in the outer circular surface of the fixed cylinder, and wedge-shaped blocks are inserted into inner cavities of the square holes in a sliding manner; according to the femoral component fixing device, through the arrangement of the pushing piece, the nut is rotated, the multiple wedge-shaped blocks can be easily pushed into the fixing barrel at the same time through the contact between the opening portion above the nut and the inclined faces of the wedge-shaped blocks, and therefore the femoral component fixing device can be used for fixing the femoral component. According to the device, the handle of the femoral component can be rapidly fixed at multiple angles, the device is quite rapid and convenient, the fixing effect is good, meanwhile, the tightening degree of the nut is adjusted, the distance of the end of the wedge-shaped block entering the inner cavity of the fixing barrel is controlled, accordingly, the femoral components of different models are clamped, and the universality of the device is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of femoral component with handle fatigue performance testing device, concretely to a femoral component with handle fatigue performance testing device. BACKGROUND

[0002] In the process of daily exercise, travel, competition, human organization, joint and bone will inevitably appear strain, in order to ensure that normal life after the occurrence of related problems, thus giving birth to surgical implants, at present, common surgical implants are composed of titanium alloy, iron alloy, ceramic and synthetic material, the material in these implants should ensure that it is not damaged within a certain service period, therefore, surgical implants need to accept various performance tests, and the most critical test is fatigue performance test.

[0003] The Chinese patent with publication number CN112284714B discloses a femoral component with handle testing tool and testing method, the testing tool includes a platform, a position adjusting device, a clamping device, a curing tank body and a protractor, the position adjusting device includes a vertical rod, a horizontal rotating device and a crossbar, the vertical rod is attached to the platform, the horizontal rotating device is attached to the vertical rod, and the crossbar is attached to the horizontal rotating device. The clamping device includes a V-shaped clamping block and multiple spherical clamping blocks, the V-shaped clamping block is attached to the crossbar, and a locking mechanism is provided to connect the V-shaped clamping block and a spherical clamping block to clamp the head of the femoral component with handle. The curing tank body is attached to the platform, and the handle of the femoral component with handle is inserted into the curing tank body. The protractor is attached to the platform. It has the following advantages: the femoral component with handle testing tool adopts a modular structure, can adapt to different sizes of human bones, can meet the testing tool of femoral components of different sizes, is easy to disassemble and operate, can fix the sample and finally test.

[0004] The above-mentioned femoral component with handle testing tool has some problems in use. The handle of the femoral component needs to be placed in the curing tank body, and then slurry is injected for curing to fix the femoral component. However, factors such as the curing speed and uniformity of the slurry may affect the connection effect between the handle of the femoral component with handle and the curing tank body. If the curing is uneven or the curing speed does not meet the requirements, the test result may be inaccurate, and even the handle may be separated from the curing tank body during the fatigue test. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a femoral component with handle fatigue performance testing device to solve the problem that factors such as the curing speed and uniformity of the slurry may affect the connection effect between the handle of the femoral component with handle and the curing tank body, and if the curing is uneven or the curing speed does not meet the requirements, the test result may be inaccurate, and even the handle may be separated from the curing tank body during the fatigue test.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A fatigue performance testing device for a femoral component with a handle includes a worktable, a fixed cylinder fixedly mounted on the top of the worktable, a plurality of square holes on the outer circular surface of the fixed cylinder, wedge blocks slidably inserted into the inner cavity of each square hole, a pusher provided on the outer circular surface of the fixed cylinder to simultaneously push the ends of the wedge blocks into the fixed cylinder to fix the handle of the femoral component, a fixing ring on the top of the worktable and located at a corresponding position on the outer circular surface of the fixed cylinder, and a test component for conducting an aging test on the femoral component provided on one side of the fixing ring;

[0008] The pusher includes an external thread disposed on the surface of the fixed cylinder and located below the square hole. A nut is threadedly connected to the surface of the fixed cylinder via the external thread, and the upper opening of the nut contacts the inclined surface of the wedge block.

[0009] As a preferred technical solution, the test assembly includes a fixed column fixedly installed on one side of a fixed ring. A strip plate is rotatably sleeved on the surface of the fixed column. The end of the strip plate extends upward to the top of the fixed cylinder. A strip hole is formed on the upper surface of the strip plate along its length. A connecting block is slidably connected to the inner cavity of the strip hole. A lead screw is threaded through the surface of the connecting block. One end of the lead screw extends to the top of the fixed cylinder and is fixedly connected to a second clamping plate. A first clamping plate is connected to one side of the second clamping plate through a spacing adjustment assembly.

[0010] As a preferred technical solution, the wedge block has a guide hole in the middle that runs along its length, and a fixing strip is slidably connected to the middle of the guide hole. The upper and lower ends of the fixing strip are respectively fixedly connected to the upper and lower inner walls of the corresponding side square hole. A spring is fixedly connected to the side of the fixing strip away from the inner cavity of the fixing cylinder, and the other end of the spring is fixedly connected to the inner wall of the corresponding side guide hole.

[0011] As a preferred technical solution, limit grooves are formed on both sides of the wedge block, and limit strips are slidably connected to the inner cavities of the limit grooves. The two sets of limit strips on the same side are respectively fixedly connected to the inner walls of the corresponding square holes on the corresponding sides.

[0012] As a preferred technical solution, the end of the wedge-shaped block located in the inner cavity of the fixed cylinder is provided with an arc-shaped opening that is adapted to the surface of the femoral component, and the inner cavity of the arc-shaped opening is provided with an anti-slip layer.

[0013] As a preferred technical solution, the spacing adjustment component includes a circular hole at the end of the first clamping plate, a screw is slidably inserted into the inner cavity of the circular hole, the end of the screw passes through the circular hole and is fixedly connected to the end surface of the second clamping plate, and the other end of the screw is threadedly connected to a fixing nut, one side of the fixing nut abutting against the end surface of the first clamping plate.

[0014] As a preferred technical solution, a guide strip is fixedly connected to the upper inner wall of the circular hole, and a guide groove is formed on the surface of the screw along its length, with the guide strip slidably connected to the inner cavity of the guide groove.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This utility model, through the setting of the pusher, rotates the nut and utilizes the contact between the upper opening of the nut and the inclined surface of the wedge block to easily push multiple wedge blocks into the fixed cylinder at the same time, realizing the rapid fixation of the femoral component stem from multiple angles. It is very fast and convenient with good fixation effect. At the same time, by adjusting the tightness of the nut, the distance of the wedge block end into the inner cavity of the fixed cylinder is controlled, thereby clamping different models of femoral components and improving the versatility of the device.

[0017] 2. By using the arc-shaped opening and anti-slip layer, the arc-shaped opening at the end of the wedge block can closely fit the shape of the femoral component stem, significantly increasing the contact area between the two, making the fixing force distribution more uniform, and avoiding damage to the component caused by local stress concentration. At the same time, the anti-slip layer greatly increases the friction between the wedge block and the femoral component stem, effectively preventing the component from sliding during fixing and testing, greatly enhancing the reliability and stability of fixing, and ensuring that the test can be carried out smoothly.

[0018] 3. By incorporating a spring, this utility model provides a buffering force when the wedge block moves, preventing damage to the components from rigid impacts. At the same time, after loosening the nut, it can quickly help the wedge block return to its original position, preparing it for the next fixing operation, thus improving operating efficiency and the service life of the fixture. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the fatigue performance testing device for the handle-type femoral component of this utility model.

[0020] Figure 2 This is a cross-sectional view of the solid cylinder of this utility model;

[0021] Figure 3 This is a schematic diagram of the square hole structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the strip plate of this utility model.

[0023] In the picture:

[0024] 100. Workbench; 101. Fixing ring;

[0025] 200. Fixed cylinder; 201. External thread; 202. Nut; 203. Wedge block; 204. Guide hole; 205. Fixing strip; 206. Spring; 207. Anti-slip layer; 208. Limiting groove; 209. Arc-shaped opening; 210. Limiting strip; 211. Square hole;

[0026] 300. Fixed post; 301. Strip plate; 302. Screw rod; 303. Connecting block; 304. Handle; 305. Second clamping plate; 306. Screw rod; 307. First clamping plate; 308. Round hole; 309. Guide strip; 310. Guide groove; 311. Fixed nut; 312. Strip hole. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figures 1-4 This embodiment provides a fatigue performance testing device for a femoral component with a handle, including a workbench 100. A fixing cylinder 200 is fixedly installed on the top of the workbench 100. The outer circular surface of the fixing cylinder 200 is provided with a plurality of square holes 211. Wedge blocks 203 are slidably inserted into the inner cavity of each square hole 211. A pushing member is provided on the outer circular surface of the fixing cylinder 200 to simultaneously push the end of the wedge block 203 into the interior of the fixing cylinder 200 to fix the handle of the femoral component. A fixing ring 101 is located on the top of the workbench 100 and at a corresponding position on the outer circular surface of the fixing cylinder 200. A test component for aging test of the femoral component is provided on one side of the fixing ring 101.

[0029] The pusher includes an external thread 201 located on the surface of the fixing cylinder 200 and below the square hole 211. A nut 202 is threadedly connected to the surface of the fixing cylinder 200 via the external thread 201. The upper opening of the nut 202 contacts the inclined surface of the wedge block 203. By rotating the nut 202 and utilizing the contact between the upper opening of the nut 202 and the inclined surface of the wedge block 203, multiple wedge blocks 203 can be easily pushed into the fixing cylinder 200 simultaneously, achieving rapid fixation of the femoral component stem at multiple angles. This is very fast, convenient, and provides a good fixation effect. At the same time, by adjusting the tightness of the nut 202, the distance of the wedge block 203 end entering the inner cavity of the fixing cylinder 200 can be controlled, thereby clamping different models of femoral components and improving the versatility of the device.

[0030] The test assembly includes a fixed post 300 fixedly mounted on one side of a fixed ring 101. A strip plate 301 is rotatably sleeved on the surface of the fixed post 300. The end of the strip plate 301 extends upward to above the fixed cylinder 200. A handle 304 is fixedly connected to the top of the strip plate 301. A strip hole 312 is formed along the length of the upper surface of the strip plate 301. A connecting block 303 is slidably connected to the inner cavity of the strip hole 312. A lead screw 302 is threaded through the surface of the connecting block 303. One end of the lead screw 302 extends above the fixed cylinder 200 and is fixedly connected to a second clamping plate 305. One side of the second clamping plate 305 is connected to a first clamping plate 305 via a spacing adjustment assembly. The clamping plate 307, through the setting of the test assembly, allows the strip plate 301 rotatably fitted on the fixing column 300 to rotate freely, facilitating angle adjustment. This enables the end of the strip plate 301 to be precisely positioned at different positions above the fixing cylinder 200. In conjunction with the connecting block 303 that can slide up and down within the strip hole 312 and the screw 302, the height and position of the second clamping plate 305 can be flexibly adjusted to precisely adapt to femoral components of various sizes and positions, meeting diverse aging test requirements and greatly expanding the applicability of the test fixture. At the same time, the operator can precisely rotate the screw 302 to move the second clamping plate 305 to one side of the femoral component head, adapting to femoral components of different diameters.

[0031] The wedge block 203 has a guide hole 204 extending along its length in the middle. A fixing strip 205 is slidably connected to the middle of the guide hole 204. The upper and lower ends of the fixing strip 205 are fixedly connected to the upper and lower inner walls of the corresponding side square hole 211, respectively. A spring 206 is fixedly connected to the side of the fixing strip 205 away from the inner cavity of the fixing cylinder 200. The other end of the spring 206 is fixedly connected to the inner wall of the corresponding side guide hole 204. With the setting of the spring 206, the spring 206 provides a buffer force when the wedge block 203 moves, avoiding rigid impact from damaging the component. At the same time, after the nut 202 is loosened, it can quickly help the wedge block 203 reset, preparing for the next fixing operation, thus improving the operating efficiency and the service life of the fixture.

[0032] The wedge block 203 has limiting grooves 208 on both sides, and limiting strips 210 are slidably connected to the inner cavity of the limiting grooves 208. The two sets of limiting strips 210 on the same side are fixedly connected to the inner wall of the corresponding side square hole 211. By setting the limiting grooves 208 and limiting strips 210, the wedge block 203 is effectively prevented from twisting or shifting during the sliding process, ensuring that it always moves accurately along the predetermined direction, providing a more stable and reliable fixation for the femoral component stem, and further improving the stability and accuracy of the clamp during the fixation process.

[0033] The wedge-shaped block 203 located in the inner cavity of the fixing cylinder 200 has an arc-shaped opening 209 at its end that is adapted to the surface of the femoral component. The inner cavity of the arc-shaped opening 209 is provided with an anti-slip layer 207. Through the setting of the arc-shaped opening 209 and the anti-slip layer 207, the arc-shaped opening 209 at the end of the wedge-shaped block 203 can closely fit the shape of the femoral component stem, significantly increasing the contact area between the two, making the fixing force distribution more uniform, and avoiding local stress concentration that could damage the component. At the same time, the setting of the anti-slip layer 207 greatly increases the friction between the wedge-shaped block 203 and the femoral component stem, effectively preventing the component from sliding during fixing and testing, greatly enhancing the reliability and stability of fixing, and ensuring that the test can be carried out smoothly.

[0034] The anti-slip layer 207 is formed by combining one or more of polyurethane, nitrile rubber, and silicone.

[0035] The spacing adjustment component includes a circular hole 308 at the end of the first clamping plate 307. A screw 306 is slidably inserted into the inner cavity of the circular hole 308. The end of the screw 306 passes through the circular hole 308 and is fixedly connected to the end surface of the second clamping plate 305. The other end of the screw 306 is threadedly connected to a fixing nut 311. One side of the fixing nut 311 abuts against the end surface of the first clamping plate 307. By setting up the spacing adjustment component, the operator can rotate the fixing nut 311 according to the specific size of the femoral component, so that it can move on the screw 306, thereby pushing the first clamping plate 307 inward and quickly adjusting the spacing between the first clamping plate 307 and the second clamping plate 305, so as to achieve a firm clamping of femoral components of different sizes and improve the applicability of the device.

[0036] A guide strip 309 is fixedly connected to the upper inner wall of the circular hole 308. A guide groove 310 is provided on the surface of the screw 306 along its length. The guide strip 309 is slidably connected to the inner cavity of the guide groove 310. Through the setting of the guide strip 309 and the guide groove 310, the cooperation between the guide strip 309 and the guide groove 310 effectively prevents the first clamping plate 307 from flipping over, ensuring that the spacing adjustment process between the first clamping plate 307 and the second clamping plate 305 is smooth and stable.

[0037] Working principle;

[0038] First, the stem of the femoral component is inserted into the inner cavity of the fixation tube 200. Then, when the nut 202 is rotated upward, the upper opening of the nut 202 contacts the inclined surface of the wedge block 203. The upward movement of the nut 202 will push the wedge block 203 to slide into the fixation tube 200 along the square hole 211. The end of the wedge block 203 enters the interior of the fixation tube 200, thereby tightly squeezing and fixing the stem of the femoral component inside the fixation tube 200.

[0039] At this point, slide the connecting block 303 upward along the strip hole 312 to the head of the femoral component, and rotate the second clamping plate 305 to screw the screw rod 302 into the connecting block 303 until the clamping end of the second clamping plate 305 contacts the head surface of the femoral component. Then, take out the first clamping plate 307 and fit the round hole 308 opened on the end surface of the first clamping plate 307 onto the surface of the screw rod 302.

[0040] Then, the end of the lead screw 302 is threaded to the fixing nut 311. Rotating the fixing nut 311 allows it to move on the lead screw 306, thereby pushing the first clamping plate 307 inward and adjusting the distance between the first clamping plate 307 and the second clamping plate 305 to clamp the head of the femoral component.

[0041] At this point, grasp the handle 304 and rotate the end of the strip plate 301 to one side. The strip plate 301 can rotate around the fixed post 300, thereby conducting an aging test on the femoral component.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fatigue performance testing device for a stemmed femoral component, characterized in that, The device includes a workbench (100), a fixed cylinder (200) is fixedly installed on the top of the workbench (100), the outer circular surface of the fixed cylinder (200) is provided with a number of square holes (211), the inner cavity of each square hole (211) is slidably inserted with a wedge block (203), the outer circular surface of the fixed cylinder (200) is provided with a pusher that simultaneously pushes the end of the wedge block (203) into the fixed cylinder (200) to fix the handle of the femoral component, the top of the workbench (100) and the corresponding position on the outer circular surface of the fixed cylinder (200) are fixed rings (101), one side of the fixed ring (101) is provided with a test assembly for aging tests on the femoral component; The pusher includes an external thread (201) disposed on the surface of the fixed cylinder (200) and located below the square hole (211). The surface of the fixed cylinder (200) is threaded with a nut (202) through the external thread (201). The upper opening of the nut (202) contacts the inclined surface of the wedge block (203).

2. The fatigue performance testing device for a stemmed femoral component according to claim 1, characterized in that: The test assembly includes a fixed post (300) fixedly installed on one side of a fixed ring (101). A strip plate (301) is rotatably sleeved on the surface of the fixed post (300). The end of the strip plate (301) extends upward to the top of the fixed cylinder (200). A strip hole (312) is provided on the upper surface of the strip plate (301) along its length. A connecting block (303) is slidably connected to the inner cavity of the strip hole (312). A lead screw (302) is threaded through the surface of the connecting block (303). One end of the lead screw (302) extends to the top of the fixed cylinder (200) and is fixedly connected to a second clamping plate (305). A first clamping plate (307) is connected to one side of the second clamping plate (305) through a spacing adjustment assembly.

3. The fatigue performance testing device for a stemmed femoral component according to claim 1, characterized in that: The wedge block (203) has a guide hole (204) in the middle that extends along its length. A fixing strip (205) is slidably connected to the middle of the guide hole (204). The upper and lower ends of the fixing strip (205) are respectively fixedly connected to the upper and lower inner walls of the corresponding side square hole (211). A spring (206) is fixedly connected to the side of the fixing strip (205) away from the inner cavity of the fixing cylinder (200). The other end of the spring (206) is fixedly connected to the inner wall of the corresponding side guide hole (204).

4. The fatigue performance testing device for a stemmed femoral component according to claim 3, characterized in that: The wedge block (203) has limit grooves (208) on both sides. The inner cavity of the limit groove (208) is slidably connected to the limit strip (210). The two sets of limit strips (210) on the same side are respectively fixedly connected to the inner wall of the corresponding side square hole (211).

5. The fatigue performance testing device for a stemmed femoral component according to claim 1, characterized in that: The wedge-shaped block (203) located in the inner cavity of the fixing cylinder (200) has an arc-shaped opening (209) adapted to the surface of the femoral component at its end, and the inner cavity of the arc-shaped opening (209) is provided with an anti-slip layer (207).

6. The fatigue performance testing device for a stemmed femoral component according to claim 2, characterized in that: The spacing adjustment assembly includes a circular hole (308) at the end of the first clamping plate (307), a screw (306) is slidably inserted into the inner cavity of the circular hole (308), the end of the screw (306) passes through the circular hole (308) and is fixedly connected to the end surface of the second clamping plate (305), and the other end of the screw (306) is threadedly connected to a fixing nut (311), one side of the fixing nut (311) abuts against the end surface of the first clamping plate (307).

7. The fatigue performance testing device for a stemmed femoral component according to claim 6, characterized in that: A guide strip (309) is fixedly connected to the upper inner wall of the circular hole (308), and a guide groove (310) is provided on the surface of the screw (306) along its length. The guide strip (309) is slidably connected to the inner cavity of the guide groove (310).

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